Audio Issue

It began as so, My computer froze one night, which rarely happens. So I rebooted it by holding the button on my tower. I turn it on then this screen pops up, with a few options.

Starts Windows Manually, and a few others. I clicked each and all it did was restart my pc.

I clicked System Options before it got to the screen above, It was something like System recovery. Anyways it worked, My whole computer was brand new. I had to register my name, where i bought it, etc.

But then.. I could no longer play games, its video card was gone. It had no audio, and the programs it originally came with were gone.

I have the OS disk, which I heard is what I need to re-install everything. But when i put it in, and restart my pc nothing occurs. I heard I need to edit my BIOS, but I do not know which. Can anyone help? Id appreciate it.

Should I just return it to the manufacturer? I still have the warranty.